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greg |
1.1 |
/* Copyright (c) 1994 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* Parse an MGF file, converting or discarding unsupported entities
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*/
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#include <stdio.h>
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#include <math.h>
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#include <ctype.h>
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#include <string.h>
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#include "parser.h"
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#include "lookup.h"
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#include "messages.h"
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/*
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* Global definitions of variables declared in parser.h
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*/
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/* entity names */
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char mg_ename[MG_NENTITIES][MG_MAXELEN] = MG_NAMELIST;
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/* Handler routines for each entity */
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int (*mg_ehand[MG_NENTITIES])();
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/* error messages */
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char *mg_err[MG_NERRS] = MG_ERRLIST;
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MG_FCTXT *mg_file; /* current file context pointer */
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int mg_nqcdivs = MG_NQCD; /* number of divisions per quarter circle */
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/*
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* The idea with this parser is to compensate for any missing entries in
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* mg_ehand with alternate handlers that express these entities in terms
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* of others that the calling program can handle.
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*
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* In some cases, no alternate handler is possible because the entity
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* has no approximate equivalent. These entities are simply discarded.
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*
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* Certain entities are dependent on others, and mg_init() will fail
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* if the supported entities are not consistent.
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*
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* Some alternate entity handlers require that earlier entities be
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* noted in some fashion, and we therefore keep another array of
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* parallel support handlers to assist in this effort.
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*/
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/* temporary settings for testing */
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#define e_ies e_any_toss
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/* alternate handler routines */
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static int e_any_toss(), /* discard unneeded entity */
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e_ies(); /* IES luminaire file */
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e_include(), /* include file */
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e_sph(), /* sphere */
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e_cyl(), /* cylinder */
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e_cone(), /* cone */
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e_ring(), /* ring */
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e_torus(); /* torus */
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/* alternate handler support functions */
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static int (*e_supp[MG_NENTITIES])();
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static char FLTFMT[] = "%.12g";
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static int warpconends; /* hack for generating good normals */
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void
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mg_init() /* initialize alternate entity handlers */
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{
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unsigned long ineed = 0, uneed = 0;
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register int i;
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/* pick up slack */
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if (mg_ehand[MG_E_IES] == NULL)
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mg_ehand[MG_E_IES] = e_ies;
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if (mg_ehand[MG_E_INCLUDE] == NULL)
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mg_ehand[MG_E_INCLUDE] = e_include;
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if (mg_ehand[MG_E_SPH] == NULL) {
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mg_ehand[MG_E_SPH] = e_sph;
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ineed |= 1<<MG_E_POINT|1<<MG_E_VERTEX;
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} else
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<MG_E_XF;
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if (mg_ehand[MG_E_CYL] == NULL) {
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mg_ehand[MG_E_CYL] = e_cyl;
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ineed |= 1<<MG_E_POINT|1<<MG_E_VERTEX;
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} else
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<MG_E_XF;
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if (mg_ehand[MG_E_CONE] == NULL) {
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mg_ehand[MG_E_CONE] = e_cone;
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ineed |= 1<<MG_E_POINT|1<<MG_E_VERTEX;
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} else
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<MG_E_XF;
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if (mg_ehand[MG_E_RING] == NULL) {
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mg_ehand[MG_E_RING] = e_ring;
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ineed |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX;
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} else
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uneed |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX|1<<MG_E_XF;
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if (mg_ehand[MG_E_TORUS] == NULL) {
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mg_ehand[MG_E_TORUS] = e_torus;
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ineed |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX;
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} else
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uneed |= 1<<MG_E_POINT|1<<MG_E_NORMAL|1<<MG_E_VERTEX|1<<MG_E_XF;
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/* check for consistency */
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if (mg_ehand[MG_E_FACE] != NULL)
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uneed |= 1<<MG_E_POINT|1<<MG_E_VERTEX|1<<MG_E_XF;
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if (mg_ehand[MG_E_CXY] != NULL)
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uneed |= 1<<MG_E_COLOR;
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if (mg_ehand[MG_E_RD] != NULL || mg_ehand[MG_E_TD] != NULL ||
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mg_ehand[MG_E_ED] != NULL ||
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mg_ehand[MG_E_RS] != NULL ||
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mg_ehand[MG_E_TS] != NULL)
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uneed |= 1<<MG_E_MATERIAL;
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for (i = 0; i < MG_NENTITIES; i++)
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if (uneed & 1<<i && mg_ehand[i] == NULL) {
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fprintf(stderr, "Missing support for \"%s\" entity\n",
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mg_ename[i]);
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exit(1);
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}
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/* add support as needed */
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if (ineed & 1<<MG_E_VERTEX && mg_ehand[MG_E_VERTEX] != c_hvertex)
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e_supp[MG_E_VERTEX] = c_hvertex;
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if (ineed & 1<<MG_E_POINT && mg_ehand[MG_E_POINT] != c_hvertex)
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e_supp[MG_E_POINT] = c_hvertex;
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if (ineed & 1<<MG_E_NORMAL && mg_ehand[MG_E_NORMAL] != c_hvertex)
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e_supp[MG_E_NORMAL] = c_hvertex;
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/* discard remaining entities */
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for (i = 0; i < MG_NENTITIES; i++)
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if (mg_ehand[i] == NULL)
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mg_ehand[i] = e_any_toss;
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}
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int
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mg_entity(name) /* get entity number from its name */
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char *name;
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{
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static LUTAB ent_tab; /* entity lookup table */
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register char *cp;
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if (!ent_tab.tsiz) { /* initialize hash table */
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if (!lu_init(&ent_tab, MG_NENTITIES))
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return(-1); /* what to do? */
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for (cp = mg_ename[MG_NENTITIES-1]; cp >= mg_ename[0];
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cp -= sizeof(mg_ename[0]))
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lu_find(&ent_tab, cp)->key = cp;
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}
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cp = lu_find(&ent_tab, name)->key;
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if (cp == NULL)
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return(-1);
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return((cp - mg_ename[0])/sizeof(mg_ename[0]));
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}
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static int
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handle_it(en, ac, av) /* pass entity to appropriate handler */
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register int en;
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int ac;
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char **av;
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{
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int rv;
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if (en < 0 && (en = mg_entity(av[0])) < 0)
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return(MG_EUNK);
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if (e_supp[en] != NULL) {
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if ((rv = (*e_supp[en])(ac, av)) != MG_OK)
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return(rv);
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}
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return((*mg_ehand[en])(ac, av));
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}
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int
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mg_open(ctx, fn) /* open new input file */
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register MG_FCTXT *ctx;
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char *fn;
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{
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int olen;
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register char *cp;
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ctx->lineno = 0;
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if (fn == NULL) {
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ctx->fname = "<stdin>";
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ctx->fp = stdin;
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ctx->prev = mg_file;
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mg_file = ctx;
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return(MG_OK);
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}
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/* get name relative to this context */
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if (mg_file != NULL &&
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(cp = strrchr(mg_file->fname, '/')) != NULL)
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olen = cp - mg_file->fname + 1;
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else
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olen = 0;
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ctx->fname = (char *)malloc(olen+strlen(fn)+1);
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if (ctx->fname == NULL)
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return(MG_EMEM);
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if (olen)
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strcpy(ctx->fname, mg_file->fname);
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strcpy(ctx->fname+olen, fn);
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ctx->fp = fopen(ctx->fname, "r");
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if (ctx->fp == NULL) {
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free((MEM_PTR)ctx->fname);
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return(MG_ENOFILE);
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}
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ctx->prev = mg_file; /* establish new context */
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mg_file = ctx;
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return(MG_OK);
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}
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void
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mg_close() /* close input file */
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{
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register MG_FCTXT *ctx = mg_file;
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mg_file = ctx->prev; /* restore enclosing context */
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if (ctx->fp == stdin)
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return; /* don't close standard input */
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fclose(ctx->fp);
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free((MEM_PTR)ctx->fname);
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}
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int
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mg_rewind() /* rewind input file */
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{
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if (mg_file->lineno == 0)
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return(MG_OK);
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if (mg_file->fp == stdin)
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return(MG_ESEEK); /* cannot seek on standard input */
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if (fseek(mg_file->fp, 0L, 0) == EOF)
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return(MG_ESEEK);
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mg_file->lineno = 0;
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return(MG_OK);
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}
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int
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mg_read() /* read next line from file */
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{
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register int len = 0;
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do {
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if (fgets(mg_file->inpline+len,
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MG_MAXLINE-len, mg_file->fp) == NULL)
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return(len);
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mg_file->lineno++;
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len += strlen(mg_file->inpline+len);
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if (len > 1 && mg_file->inpline[len-2] == '\\')
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mg_file->inpline[--len-1] = ' ';
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} while (mg_file->inpline[len]);
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return(len);
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}
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int
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mg_parse() /* parse current input line */
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| 268 |
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{
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char abuf[MG_MAXLINE];
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char *argv[MG_MAXARGC];
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| 271 |
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int en;
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| 272 |
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register char *cp, **ap;
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strcpy(cp=abuf, mg_file->inpline);
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| 275 |
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ap = argv; /* break into words */
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| 276 |
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for ( ; ; ) {
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| 277 |
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while (isspace(*cp))
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| 278 |
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*cp++ = '\0';
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| 279 |
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if (!*cp)
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| 280 |
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break;
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| 281 |
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if (ap - argv >= MG_MAXARGC-1)
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| 282 |
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return(MG_EARGC);
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| 283 |
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*ap++ = cp;
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| 284 |
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while (*++cp && !isspace(*cp))
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| 285 |
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;
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| 286 |
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}
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| 287 |
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if (ap == argv)
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| 288 |
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return(MG_OK); /* no words in line */
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| 289 |
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*ap = NULL;
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| 290 |
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/* else handle it */
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| 291 |
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return(handle_it(-1, ap-argv, argv));
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| 292 |
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}
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| 293 |
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| 294 |
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| 295 |
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int
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| 296 |
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mg_load(fn) /* load an MGF file */
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| 297 |
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char *fn;
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| 298 |
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{
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| 299 |
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MG_FCTXT cntxt;
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| 300 |
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int rval;
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| 301 |
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| 302 |
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if ((rval = mg_open(&cntxt, fn)) != MG_OK) {
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| 303 |
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fprintf("%s: %s\n", fn, mg_err[rval]);
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| 304 |
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return(rval);
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| 305 |
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}
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| 306 |
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while (mg_read()) /* parse each line */
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| 307 |
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if ((rval = mg_parse()) != MG_OK) {
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| 308 |
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fprintf(stderr, "%s: %d: %s:\n%s", cntxt.fname,
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| 309 |
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cntxt.lineno, mg_err[rval],
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| 310 |
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cntxt.inpline);
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| 311 |
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break;
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| 312 |
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}
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| 313 |
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mg_close();
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| 314 |
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return(rval);
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| 315 |
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}
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| 316 |
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| 317 |
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| 318 |
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void
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| 319 |
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mg_clear() /* clear parser history */
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| 320 |
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{
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| 321 |
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c_clearall(); /* clear context tables */
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| 322 |
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mg_file = NULL; /* reset our context */
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| 323 |
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}
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| 324 |
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| 325 |
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| 326 |
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int
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| 327 |
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mg_iterate(ac, av, f) /* iterate on statement */
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| 328 |
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int ac;
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| 329 |
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register char **av;
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| 330 |
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int (*f)();
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| 331 |
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{
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| 332 |
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int niter, rval;
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| 333 |
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register int i, j;
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| 334 |
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char *argv[MG_MAXARGC];
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| 335 |
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char cntbuf[10];
|
| 336 |
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/* build partial transformation */
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| 337 |
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for (i = 0; i < ac; i++) {
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| 338 |
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if (av[i][0] == '-' && av[i][1] == 'a' && av[i][2] == '\0')
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| 339 |
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break;
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| 340 |
|
|
argv[i+1] = av[i];
|
| 341 |
|
|
}
|
| 342 |
|
|
argv[i+1] = NULL;
|
| 343 |
|
|
if (i) { /* handle transformation */
|
| 344 |
|
|
argv[0] = mg_ename[MG_E_XF];
|
| 345 |
|
|
if ((rval = handle_it(MG_E_XF, i+1, argv)) != MG_OK)
|
| 346 |
|
|
return(rval);
|
| 347 |
|
|
}
|
| 348 |
|
|
if (i < ac) { /* run array */
|
| 349 |
|
|
if (i+1 >= ac || !isint(av[i+1]))
|
| 350 |
|
|
return(MG_ETYPE);
|
| 351 |
|
|
niter = atoi(av[i+1]);
|
| 352 |
|
|
argv[0] = "-i";
|
| 353 |
|
|
argv[1] = cntbuf;
|
| 354 |
|
|
for (j = 2; j+i < ac; j++)
|
| 355 |
|
|
argv[j] = av[j+i];
|
| 356 |
|
|
argv[j] = NULL;
|
| 357 |
|
|
for (j = 0; j < niter; j++) {
|
| 358 |
|
|
sprintf(cntbuf, "%d", j);
|
| 359 |
|
|
if ((rval = mg_iterate(ac-i, argv, f)) != MG_OK)
|
| 360 |
|
|
return(rval);
|
| 361 |
|
|
}
|
| 362 |
|
|
} else if ((rval = (*f)()) != MG_OK) /* else do this instance */
|
| 363 |
|
|
return(rval);
|
| 364 |
|
|
if (i) { /* reset the transform */
|
| 365 |
|
|
argv[0] = mg_ename[MG_E_XF];
|
| 366 |
|
|
argv[1] = NULL;
|
| 367 |
|
|
(void)handle_it(MG_E_XF, 1, argv);
|
| 368 |
|
|
}
|
| 369 |
|
|
return(MG_OK);
|
| 370 |
|
|
}
|
| 371 |
|
|
|
| 372 |
|
|
|
| 373 |
|
|
/****************************************************************************
|
| 374 |
|
|
* The following routines handle unsupported entities
|
| 375 |
|
|
*/
|
| 376 |
|
|
|
| 377 |
|
|
|
| 378 |
|
|
static int
|
| 379 |
|
|
e_any_toss(ac, av) /* discard an unwanted entity */
|
| 380 |
|
|
int ac;
|
| 381 |
|
|
char **av;
|
| 382 |
|
|
{
|
| 383 |
|
|
return(MG_OK);
|
| 384 |
|
|
}
|
| 385 |
|
|
|
| 386 |
|
|
|
| 387 |
|
|
static int
|
| 388 |
|
|
reload_file() /* reload current MGF file */
|
| 389 |
|
|
{
|
| 390 |
|
|
register int rval;
|
| 391 |
|
|
|
| 392 |
|
|
if ((rval = mg_rewind()) != MG_OK)
|
| 393 |
|
|
return(rval);
|
| 394 |
|
|
while (mg_read())
|
| 395 |
|
|
if ((rval = mg_parse()) != MG_OK)
|
| 396 |
|
|
return(rval);
|
| 397 |
|
|
return(MG_OK);
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
|
| 401 |
|
|
static int
|
| 402 |
|
|
e_include(ac, av) /* include file */
|
| 403 |
|
|
int ac;
|
| 404 |
|
|
char **av;
|
| 405 |
|
|
{
|
| 406 |
|
|
MG_FCTXT ictx;
|
| 407 |
|
|
int rv;
|
| 408 |
|
|
|
| 409 |
|
|
if (ac < 2)
|
| 410 |
|
|
return(MG_EARGC);
|
| 411 |
|
|
if ((rv = mg_open(&ictx, av[1])) != MG_OK)
|
| 412 |
|
|
return(rv);
|
| 413 |
|
|
if ((rv = mg_iterate(ac-2, av+2, reload_file)) != MG_OK) {
|
| 414 |
|
|
fprintf(stderr, "%s: %d: %s:\n%s", ictx.fname,
|
| 415 |
|
|
ictx.lineno, mg_err[rv], ictx.inpline);
|
| 416 |
|
|
mg_close();
|
| 417 |
|
|
return(MG_EINCL);
|
| 418 |
|
|
}
|
| 419 |
|
|
mg_close();
|
| 420 |
|
|
return(MG_OK);
|
| 421 |
|
|
}
|
| 422 |
|
|
|
| 423 |
|
|
|
| 424 |
|
|
static void
|
| 425 |
|
|
make_axes(u, v, w) /* compute u and v given w (normalized) */
|
| 426 |
|
|
FVECT u, v, w;
|
| 427 |
|
|
{
|
| 428 |
|
|
register int i;
|
| 429 |
|
|
|
| 430 |
|
|
v[0] = v[1] = v[2] = 0.;
|
| 431 |
|
|
for (i = 0; i < 3; i++)
|
| 432 |
|
|
if (w[i] < .6 && w[i] > -.6)
|
| 433 |
|
|
break;
|
| 434 |
|
|
v[i] = 1.;
|
| 435 |
|
|
fcross(u, v, w);
|
| 436 |
|
|
normalize(u);
|
| 437 |
|
|
fcross(v, w, u);
|
| 438 |
|
|
}
|
| 439 |
|
|
|
| 440 |
|
|
|
| 441 |
|
|
static int
|
| 442 |
|
|
e_sph(ac, av) /* expand a sphere into cones */
|
| 443 |
|
|
int ac;
|
| 444 |
|
|
char **av;
|
| 445 |
|
|
{
|
| 446 |
|
|
static char p2x[24], p2y[24], p2z[24], r1[24], r2[24];
|
| 447 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_sv1","=","_sv2"};
|
| 448 |
|
|
static char *v2ent[4] = {mg_ename[MG_E_VERTEX],"_sv2","="};
|
| 449 |
|
|
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2x,p2y,p2z};
|
| 450 |
|
|
static char *conent[6] = {mg_ename[MG_E_CONE],"_sv1",r1,"_sv2",r2};
|
| 451 |
|
|
register C_VERTEX *cv;
|
| 452 |
|
|
register int i;
|
| 453 |
|
|
int rval;
|
| 454 |
|
|
double rad;
|
| 455 |
|
|
double theta;
|
| 456 |
|
|
|
| 457 |
|
|
if (ac != 3)
|
| 458 |
|
|
return(MG_EARGC);
|
| 459 |
|
|
if ((cv = c_getvert(av[1])) == NULL)
|
| 460 |
|
|
return(MG_EUNDEF);
|
| 461 |
|
|
if (!isflt(av[2]))
|
| 462 |
|
|
return(MG_ETYPE);
|
| 463 |
|
|
rad = atof(av[2]);
|
| 464 |
|
|
/* initialize */
|
| 465 |
|
|
warpconends = 1;
|
| 466 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 3, v2ent)) != MG_OK)
|
| 467 |
|
|
return(rval);
|
| 468 |
|
|
sprintf(p2x, FLTFMT, cv->p[0]);
|
| 469 |
|
|
sprintf(p2y, FLTFMT, cv->p[1]);
|
| 470 |
|
|
sprintf(p2z, FLTFMT, cv->p[2]+rad);
|
| 471 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK)
|
| 472 |
|
|
return(rval);
|
| 473 |
|
|
r2[0] = '0'; r2[1] = '\0';
|
| 474 |
|
|
for (i = 1; i <= 2*mg_nqcdivs; i++) {
|
| 475 |
|
|
theta = i*(PI/2)/mg_nqcdivs;
|
| 476 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK)
|
| 477 |
|
|
return(rval);
|
| 478 |
|
|
sprintf(p2z, FLTFMT, cv->p[2]+rad*cos(theta));
|
| 479 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK)
|
| 480 |
|
|
return(rval);
|
| 481 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK)
|
| 482 |
|
|
return(rval);
|
| 483 |
|
|
strcpy(r1, r2);
|
| 484 |
|
|
sprintf(r2, FLTFMT, rad*sin(theta));
|
| 485 |
|
|
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK)
|
| 486 |
|
|
return(rval);
|
| 487 |
|
|
}
|
| 488 |
|
|
warpconends = 0;
|
| 489 |
|
|
return(MG_OK);
|
| 490 |
|
|
}
|
| 491 |
|
|
|
| 492 |
|
|
|
| 493 |
|
|
static int
|
| 494 |
|
|
e_torus(ac, av) /* expand a torus into cones */
|
| 495 |
|
|
int ac;
|
| 496 |
|
|
char **av;
|
| 497 |
|
|
{
|
| 498 |
|
|
static char p2[3][24], r1[24], r2[24];
|
| 499 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_tv1","=","_tv2"};
|
| 500 |
|
|
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_tv2","="};
|
| 501 |
|
|
static char *p2ent[5] = {mg_ename[MG_E_POINT],p2[0],p2[1],p2[2]};
|
| 502 |
|
|
static char *conent[6] = {mg_ename[MG_E_CONE],"_tv1",r1,"_tv2",r2};
|
| 503 |
|
|
register C_VERTEX *cv;
|
| 504 |
|
|
register int i, j;
|
| 505 |
|
|
int rval;
|
| 506 |
|
|
int sgn;
|
| 507 |
|
|
double minrad, maxrad, avgrad;
|
| 508 |
|
|
double theta;
|
| 509 |
|
|
|
| 510 |
|
|
if (ac != 4)
|
| 511 |
|
|
return(MG_EARGC);
|
| 512 |
|
|
if ((cv = c_getvert(av[1])) == NULL)
|
| 513 |
|
|
return(MG_EUNDEF);
|
| 514 |
|
|
if (cv->n[0]==0. && cv->n[1]==0. && cv->n[2]==0.)
|
| 515 |
|
|
return(MG_EILL);
|
| 516 |
|
|
if (!isflt(av[2]) || !isflt(av[3]))
|
| 517 |
|
|
return(MG_ETYPE);
|
| 518 |
|
|
minrad = atof(av[2]);
|
| 519 |
|
|
maxrad = atof(av[3]);
|
| 520 |
|
|
/* check orientation */
|
| 521 |
|
|
if (minrad > 0.)
|
| 522 |
|
|
sgn = 1;
|
| 523 |
|
|
else if (minrad < 0.)
|
| 524 |
|
|
sgn = -1;
|
| 525 |
|
|
else if (maxrad > 0.)
|
| 526 |
|
|
sgn = 1;
|
| 527 |
|
|
else if (maxrad < 0.)
|
| 528 |
|
|
sgn = -1;
|
| 529 |
|
|
else
|
| 530 |
|
|
return(MG_EILL);
|
| 531 |
|
|
if (sgn*(maxrad-minrad) <= 0.)
|
| 532 |
|
|
return(MG_EILL);
|
| 533 |
|
|
/* initialize */
|
| 534 |
|
|
warpconends = 1;
|
| 535 |
|
|
v2ent[3] = av[1];
|
| 536 |
|
|
for (j = 0; j < 3; j++)
|
| 537 |
|
|
sprintf(p2[j], FLTFMT, cv->p[j] +
|
| 538 |
|
|
.5*sgn*(maxrad-minrad)*cv->n[j]);
|
| 539 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK)
|
| 540 |
|
|
return(rval);
|
| 541 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK)
|
| 542 |
|
|
return(rval);
|
| 543 |
|
|
sprintf(r2, FLTFMT, avgrad=.5*(minrad+maxrad));
|
| 544 |
|
|
/* run outer section */
|
| 545 |
|
|
for (i = 1; i <= 2*mg_nqcdivs; i++) {
|
| 546 |
|
|
theta = i*(PI/2)/mg_nqcdivs;
|
| 547 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK)
|
| 548 |
|
|
return(rval);
|
| 549 |
|
|
for (j = 0; j < 3; j++)
|
| 550 |
|
|
sprintf(p2[j], FLTFMT, cv->p[j] +
|
| 551 |
|
|
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]);
|
| 552 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK)
|
| 553 |
|
|
return(rval);
|
| 554 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK)
|
| 555 |
|
|
return(rval);
|
| 556 |
|
|
strcpy(r1, r2);
|
| 557 |
|
|
sprintf(r2, FLTFMT, avgrad + .5*(maxrad-minrad)*sin(theta));
|
| 558 |
|
|
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK)
|
| 559 |
|
|
return(rval);
|
| 560 |
|
|
}
|
| 561 |
|
|
/* run inner section */
|
| 562 |
|
|
sprintf(r2, FLTFMT, -.5*(minrad+maxrad));
|
| 563 |
|
|
for ( ; i <= 4*mg_nqcdivs; i++) {
|
| 564 |
|
|
theta = i*(PI/2)/mg_nqcdivs;
|
| 565 |
|
|
for (j = 0; j < 3; j++)
|
| 566 |
|
|
sprintf(p2[j], FLTFMT, cv->p[j] +
|
| 567 |
|
|
.5*sgn*(maxrad-minrad)*cos(theta)*cv->n[j]);
|
| 568 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK)
|
| 569 |
|
|
return(rval);
|
| 570 |
|
|
if ((rval = handle_it(MG_E_VERTEX, 2, v2ent)) != MG_OK)
|
| 571 |
|
|
return(rval);
|
| 572 |
|
|
if ((rval = handle_it(MG_E_POINT, 4, p2ent)) != MG_OK)
|
| 573 |
|
|
return(rval);
|
| 574 |
|
|
strcpy(r1, r2);
|
| 575 |
|
|
sprintf(r2, FLTFMT, -avgrad - .5*(maxrad-minrad)*sin(theta));
|
| 576 |
|
|
if ((rval = handle_it(MG_E_CONE, 5, conent)) != MG_OK)
|
| 577 |
|
|
return(rval);
|
| 578 |
|
|
}
|
| 579 |
|
|
warpconends = 0;
|
| 580 |
|
|
return(MG_OK);
|
| 581 |
|
|
}
|
| 582 |
|
|
|
| 583 |
|
|
|
| 584 |
|
|
static int
|
| 585 |
|
|
e_cyl(ac, av) /* replace a cylinder with equivalent cone */
|
| 586 |
|
|
int ac;
|
| 587 |
|
|
char **av;
|
| 588 |
|
|
{
|
| 589 |
|
|
static char *avnew[6] = {mg_ename[MG_E_CONE]};
|
| 590 |
|
|
|
| 591 |
|
|
if (ac != 4)
|
| 592 |
|
|
return(MG_EARGC);
|
| 593 |
|
|
avnew[1] = av[1];
|
| 594 |
|
|
avnew[2] = av[2];
|
| 595 |
|
|
avnew[3] = av[3];
|
| 596 |
|
|
avnew[4] = av[2];
|
| 597 |
|
|
return(handle_it(MG_E_CONE, 5, avnew));
|
| 598 |
|
|
}
|
| 599 |
|
|
|
| 600 |
|
|
|
| 601 |
|
|
static int
|
| 602 |
|
|
e_ring(ac, av) /* turn a ring into polygons */
|
| 603 |
|
|
int ac;
|
| 604 |
|
|
char **av;
|
| 605 |
|
|
{
|
| 606 |
|
|
static char p3[3][24], p4[3][24];
|
| 607 |
|
|
static char *nzent[5] = {mg_ename[MG_E_NORMAL],"0","0","0"};
|
| 608 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_rv1","="};
|
| 609 |
|
|
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_rv2","=","_rv3"};
|
| 610 |
|
|
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_rv3","="};
|
| 611 |
|
|
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]};
|
| 612 |
|
|
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_rv4","="};
|
| 613 |
|
|
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]};
|
| 614 |
|
|
static char *fent[6] = {mg_ename[MG_E_FACE],"_rv1","_rv2","_rv3","_rv4"};
|
| 615 |
|
|
register C_VERTEX *cv;
|
| 616 |
|
|
register int i, j;
|
| 617 |
|
|
FVECT u, v;
|
| 618 |
|
|
double minrad, maxrad;
|
| 619 |
|
|
int rv;
|
| 620 |
|
|
double theta, d;
|
| 621 |
|
|
|
| 622 |
|
|
if (ac != 4)
|
| 623 |
|
|
return(MG_EARGC);
|
| 624 |
|
|
if ((cv = c_getvert(av[1])) == NULL)
|
| 625 |
|
|
return(MG_EUNDEF);
|
| 626 |
|
|
if (cv->n[0]==0. && cv->n[1]==0. && cv->n[2]==0.)
|
| 627 |
|
|
return(MG_EILL);
|
| 628 |
|
|
if (!isflt(av[2]) || !isflt(av[3]))
|
| 629 |
|
|
return(MG_ETYPE);
|
| 630 |
|
|
minrad = atof(av[2]);
|
| 631 |
|
|
maxrad = atof(av[3]);
|
| 632 |
|
|
if (minrad < 0. || maxrad <= minrad)
|
| 633 |
|
|
return(MG_EILL);
|
| 634 |
|
|
/* initialize */
|
| 635 |
|
|
make_axes(u, v, cv->n);
|
| 636 |
|
|
for (j = 0; j < 3; j++)
|
| 637 |
|
|
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*u[j]);
|
| 638 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK)
|
| 639 |
|
|
return(rv);
|
| 640 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK)
|
| 641 |
|
|
return(rv);
|
| 642 |
|
|
if (minrad == 0.) { /* closed */
|
| 643 |
|
|
v1ent[3] = av[1];
|
| 644 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK)
|
| 645 |
|
|
return(rv);
|
| 646 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, nzent)) != MG_OK)
|
| 647 |
|
|
return(rv);
|
| 648 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) {
|
| 649 |
|
|
theta = i*(PI/2)/mg_nqcdivs;
|
| 650 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK)
|
| 651 |
|
|
return(rv);
|
| 652 |
|
|
for (j = 0; j < 3; j++)
|
| 653 |
|
|
sprintf(p3[j], FLTFMT, cv->p[j] +
|
| 654 |
|
|
maxrad*u[j]*cos(theta) +
|
| 655 |
|
|
maxrad*v[j]*sin(theta));
|
| 656 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK)
|
| 657 |
|
|
return(rv);
|
| 658 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK)
|
| 659 |
|
|
return(rv);
|
| 660 |
|
|
if ((rv = handle_it(MG_E_FACE, 4, fent)) != MG_OK)
|
| 661 |
|
|
return(rv);
|
| 662 |
|
|
}
|
| 663 |
|
|
} else { /* open */
|
| 664 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK)
|
| 665 |
|
|
return(rv);
|
| 666 |
|
|
for (j = 0; j < 3; j++)
|
| 667 |
|
|
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*u[j]);
|
| 668 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK)
|
| 669 |
|
|
return(rv);
|
| 670 |
|
|
v1ent[3] = "_rv4";
|
| 671 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) {
|
| 672 |
|
|
theta = i*(PI/2)/mg_nqcdivs;
|
| 673 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK)
|
| 674 |
|
|
return(rv);
|
| 675 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK)
|
| 676 |
|
|
return(rv);
|
| 677 |
|
|
for (j = 0; j < 3; j++) {
|
| 678 |
|
|
d = u[j]*cos(theta) + v[j]*sin(theta);
|
| 679 |
|
|
sprintf(p3[j], FLTFMT, cv->p[j] + maxrad*d);
|
| 680 |
|
|
sprintf(p4[j], FLTFMT, cv->p[j] + minrad*d);
|
| 681 |
|
|
}
|
| 682 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK)
|
| 683 |
|
|
return(rv);
|
| 684 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK)
|
| 685 |
|
|
return(rv);
|
| 686 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK)
|
| 687 |
|
|
return(rv);
|
| 688 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK)
|
| 689 |
|
|
return(rv);
|
| 690 |
|
|
if ((rv = handle_it(MG_E_FACE, 5, fent)) != MG_OK)
|
| 691 |
|
|
return(rv);
|
| 692 |
|
|
}
|
| 693 |
|
|
}
|
| 694 |
|
|
return(MG_OK);
|
| 695 |
|
|
}
|
| 696 |
|
|
|
| 697 |
|
|
|
| 698 |
|
|
static int
|
| 699 |
|
|
e_cone(ac, av) /* turn a cone into polygons */
|
| 700 |
|
|
int ac;
|
| 701 |
|
|
char **av;
|
| 702 |
|
|
{
|
| 703 |
|
|
static char p3[3][24], p4[3][24], n3[3][24], n4[3][24];
|
| 704 |
|
|
static char *v1ent[5] = {mg_ename[MG_E_VERTEX],"_cv1","="};
|
| 705 |
|
|
static char *v2ent[5] = {mg_ename[MG_E_VERTEX],"_cv2","=","_cv3"};
|
| 706 |
|
|
static char *v3ent[4] = {mg_ename[MG_E_VERTEX],"_cv3","="};
|
| 707 |
|
|
static char *p3ent[5] = {mg_ename[MG_E_POINT],p3[0],p3[1],p3[2]};
|
| 708 |
|
|
static char *n3ent[5] = {mg_ename[MG_E_NORMAL],n3[0],n3[1],n3[2]};
|
| 709 |
|
|
static char *v4ent[4] = {mg_ename[MG_E_VERTEX],"_cv4","="};
|
| 710 |
|
|
static char *p4ent[5] = {mg_ename[MG_E_POINT],p4[0],p4[1],p4[2]};
|
| 711 |
|
|
static char *n4ent[5] = {mg_ename[MG_E_NORMAL],n4[0],n4[1],n4[2]};
|
| 712 |
|
|
static char *fent[6] = {mg_ename[MG_E_FACE],"_cv1","_cv2","_cv3","_cv4"};
|
| 713 |
|
|
register C_VERTEX *cv1, *cv2;
|
| 714 |
|
|
register int i, j;
|
| 715 |
|
|
FVECT u, v, w;
|
| 716 |
|
|
double rad1, rad2;
|
| 717 |
|
|
int sgn;
|
| 718 |
|
|
double n1off, n2off;
|
| 719 |
|
|
double d;
|
| 720 |
|
|
int rv;
|
| 721 |
|
|
double theta;
|
| 722 |
|
|
|
| 723 |
|
|
if (ac != 5)
|
| 724 |
|
|
return(MG_EARGC);
|
| 725 |
|
|
if ((cv1 = c_getvert(av[1])) == NULL ||
|
| 726 |
|
|
(cv2 = c_getvert(av[3])) == NULL)
|
| 727 |
|
|
return(MG_EUNDEF);
|
| 728 |
|
|
if (!isflt(av[2]) || !isflt(av[4]))
|
| 729 |
|
|
return(MG_ETYPE);
|
| 730 |
|
|
rad1 = atof(av[2]);
|
| 731 |
|
|
rad2 = atof(av[4]);
|
| 732 |
|
|
if (rad1 == 0.) {
|
| 733 |
|
|
if (rad2 == 0.)
|
| 734 |
|
|
return(MG_EILL);
|
| 735 |
|
|
} else if (rad2 != 0.) {
|
| 736 |
|
|
if (rad1 < 0. ^ rad2 < 0.)
|
| 737 |
|
|
return(MG_EILL);
|
| 738 |
|
|
} else { /* swap */
|
| 739 |
|
|
C_VERTEX *cv;
|
| 740 |
|
|
|
| 741 |
|
|
cv = cv1;
|
| 742 |
|
|
cv1 = cv2;
|
| 743 |
|
|
cv2 = cv;
|
| 744 |
|
|
d = rad1;
|
| 745 |
|
|
rad1 = rad2;
|
| 746 |
|
|
rad2 = d;
|
| 747 |
|
|
}
|
| 748 |
|
|
sgn = rad2 < 0. ? -1 : 1;
|
| 749 |
|
|
/* initialize */
|
| 750 |
|
|
for (j = 0; j < 3; j++)
|
| 751 |
|
|
w[j] = cv1->p[j] - cv2->p[j];
|
| 752 |
|
|
if ((d = normalize(w)) == 0.)
|
| 753 |
|
|
return(MG_EILL);
|
| 754 |
|
|
n1off = n2off = (rad2 - rad1)/d;
|
| 755 |
|
|
if (warpconends) /* hack for e_sph and e_torus */
|
| 756 |
|
|
n2off = tan(atan(n2off)-(PI/4)/mg_nqcdivs);
|
| 757 |
|
|
n2off = sgn*n2off;
|
| 758 |
|
|
make_axes(u, v, w);
|
| 759 |
|
|
for (j = 0; j < 3; j++) {
|
| 760 |
|
|
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*u[j]);
|
| 761 |
|
|
sprintf(n3[j], FLTFMT, u[j] + w[j]*n2off);
|
| 762 |
|
|
}
|
| 763 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK)
|
| 764 |
|
|
return(rv);
|
| 765 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK)
|
| 766 |
|
|
return(rv);
|
| 767 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK)
|
| 768 |
|
|
return(rv);
|
| 769 |
|
|
if (rad1 == 0.) { /* triangles */
|
| 770 |
|
|
v1ent[3] = av[1];
|
| 771 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK)
|
| 772 |
|
|
return(rv);
|
| 773 |
|
|
for (j = 0; j < 3; j++)
|
| 774 |
|
|
sprintf(n4[j], FLTFMT, w[j]);
|
| 775 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK)
|
| 776 |
|
|
return(rv);
|
| 777 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) {
|
| 778 |
|
|
theta = sgn*i*(PI/2)/mg_nqcdivs;
|
| 779 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK)
|
| 780 |
|
|
return(rv);
|
| 781 |
|
|
for (j = 0; j < 3; j++) {
|
| 782 |
|
|
d = u[j]*cos(theta) + v[j]*sin(theta);
|
| 783 |
|
|
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d);
|
| 784 |
|
|
sprintf(n3[j], FLTFMT, d + w[j]*n2off);
|
| 785 |
|
|
}
|
| 786 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK)
|
| 787 |
|
|
return(rv);
|
| 788 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK)
|
| 789 |
|
|
return(rv);
|
| 790 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK)
|
| 791 |
|
|
return(rv);
|
| 792 |
|
|
if ((rv = handle_it(MG_E_FACE, 4, fent)) != MG_OK)
|
| 793 |
|
|
return(rv);
|
| 794 |
|
|
}
|
| 795 |
|
|
} else { /* quads */
|
| 796 |
|
|
v1ent[3] = "_cv4";
|
| 797 |
|
|
if (warpconends) /* hack for e_sph and e_torus */
|
| 798 |
|
|
n1off = tan(atan(n1off)+(PI/4)/mg_nqcdivs);
|
| 799 |
|
|
n1off = sgn*n1off;
|
| 800 |
|
|
for (j = 0; j < 3; j++) {
|
| 801 |
|
|
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*u[j]);
|
| 802 |
|
|
sprintf(n4[j], FLTFMT, u[j] + w[j]*n1off);
|
| 803 |
|
|
}
|
| 804 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK)
|
| 805 |
|
|
return(rv);
|
| 806 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK)
|
| 807 |
|
|
return(rv);
|
| 808 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK)
|
| 809 |
|
|
return(rv);
|
| 810 |
|
|
for (i = 1; i <= 4*mg_nqcdivs; i++) {
|
| 811 |
|
|
theta = sgn*i*(PI/2)/mg_nqcdivs;
|
| 812 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v1ent)) != MG_OK)
|
| 813 |
|
|
return(rv);
|
| 814 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 4, v2ent)) != MG_OK)
|
| 815 |
|
|
return(rv);
|
| 816 |
|
|
for (j = 0; j < 3; j++) {
|
| 817 |
|
|
d = u[j]*cos(theta) + v[j]*sin(theta);
|
| 818 |
|
|
sprintf(p3[j], FLTFMT, cv2->p[j] + rad2*d);
|
| 819 |
|
|
sprintf(n3[j], FLTFMT, d + w[j]*n2off);
|
| 820 |
|
|
sprintf(p4[j], FLTFMT, cv1->p[j] + rad1*d);
|
| 821 |
|
|
sprintf(n4[j], FLTFMT, d + w[j]*n1off);
|
| 822 |
|
|
}
|
| 823 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v3ent)) != MG_OK)
|
| 824 |
|
|
return(rv);
|
| 825 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p3ent)) != MG_OK)
|
| 826 |
|
|
return(rv);
|
| 827 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n3ent)) != MG_OK)
|
| 828 |
|
|
return(rv);
|
| 829 |
|
|
if ((rv = handle_it(MG_E_VERTEX, 3, v4ent)) != MG_OK)
|
| 830 |
|
|
return(rv);
|
| 831 |
|
|
if ((rv = handle_it(MG_E_POINT, 4, p4ent)) != MG_OK)
|
| 832 |
|
|
return(rv);
|
| 833 |
|
|
if ((rv = handle_it(MG_E_NORMAL, 4, n4ent)) != MG_OK)
|
| 834 |
|
|
return(rv);
|
| 835 |
|
|
if ((rv = handle_it(MG_E_FACE, 5, fent)) != MG_OK)
|
| 836 |
|
|
return(rv);
|
| 837 |
|
|
}
|
| 838 |
|
|
}
|
| 839 |
|
|
return(MG_OK);
|
| 840 |
|
|
}
|
